Path-py

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- ``chown`` now accepts names in addition to numeric IDs.

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- Drop support for Python 2.5. Python 2.6 or later required.
- Installation now requires setuptools.

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- Allow arbitrary callables to be passed to path.walk ``errors`` parameter.
Enables workaround for issues such as 73 and 56.

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- 61: path.listdir now decodes filenames from os.listdir when loading
characters from a file. On Python 3, the behavior is unchanged. On Python
2, the behavior will now mimick that of Python 3, attempting to decode
all filenames and paths using the encoding indicated by
``sys.getfilesystemencoding()``, and escaping any undecodable characters
using the 'surrogateescape' handler.

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- 53: Added ``path.in_place`` for editing files in place.

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- ``path.fnmatch`` now takes an optional parameter ``normcase`` and this
parameter defaults to self.module.normcase (using case normalization most
pertinent to the path object itself). Note that this change means that
any paths using a custom ntpath module on non-Windows systems will have
different fnmatch behavior. Before::

on Unix
>>> p = path('Foo')
>>> p.module = ntpath
>>> p.fnmatch('foo')
False

After::

on any OS
>>> p = path('Foo')
>>> p.module = ntpath
>>> p.fnmatch('foo')
True

To maintain the original behavior, either don't define the 'module' for the
path or supply explicit normcase function::

>>> p.fnmatch('foo', normcase=os.path.normcase)
result always varies based on OS, same as fnmatch.fnmatch

For most use-cases, the default behavior should remain the same.

- Issue 50: Methods that accept patterns (``listdir``, ``files``, ``dirs``,
``walk``, ``walkdirs``, ``walkfiles``, and ``fnmatch``) will now use a
``normcase`` attribute if it is present on the ``pattern`` parameter. The
path module now provides a ``CaseInsensitivePattern`` wrapper for strings
suitable for creating case-insensitive patterns for those methods.